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Potassium permanganate is a strong oxidizing agent, so we get:
2Na + KMnO4 + 0.5H2O = Na2O + KOH + MnO2 + 0.25O2(g)
ΔG(20C) = -365.4kJ, ΔH(20C) = -379.6kJ, so reaction is spontaneous and highly exothermic
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Assume the permanganate is acidified.
Remember the half equation of reduction of permanganate:
[math]MnO_4^-+8H^+ +5e^- ightarrow Mn^{2+} + 4H_2O[/math]
And the oxidation of sodium:
[math]Na ightarrow Na^+ + e^-[/math]
In order to cancel out the electrons, multiply the second by 5 and add into the first:
[math]5Na +MnO4^- + 8H^+ ightarrow 5Na^+ + Mn^{2+} + 4H_2O[/math]
You might want to add back the potassium ion on both sides.
This is pretty much the answer…
[math]Naightarrow Na^+ + e^-[/math]
2026-07-05
Potassium permanganate is a strong oxidizing agent, so we get:
2Na + KMnO4 + 0.5H2O = Na2O + KOH + MnO2 + 0.25O2(g)
ΔG(20C) = -365.4kJ, ΔH(20C) = -379.6kJ, so reaction is spontaneous and highly exothermic
Potassium permanganate is a strong oxidizing agent, so we get:
2Na + KMnO4 + 0.5H2O = Na2O + KOH + MnO2 + 0.25O2(g)
ΔG(20C) = -365.4kJ, ΔH(20C) = -379.6kJ, so reaction is spontaneous and highly exothermic
More
VOTE
Assume the permanganate is acidified.
Remember the half equation of reduction of permanganate:
[math]MnO_4^-+8H^+ +5e^- ightarrow Mn^{2+} + 4H_2O[/math]
And the oxidation of sodium:
[math]Na ightarrow Na^+ + e^-[/math]
In order to cancel out the electrons, multiply the second by 5 and add into the first:
[math]5Na +MnO4^- + 8H^+ ightarrow 5Na^+ + Mn^{2+} + 4H_2O[/math]
You might want to add back the potassium ion on both sides.
This is pretty much the answer…
Assume the permanganate is acidified.
Remember the half equation of reduction of permanganate:
[math]MnO_4^-+8H^+ +5e^- ightarrow Mn^{2+} + 4H_2O[/math]
And the oxidation of sodium:
[math]Naightarrow Na^+ + e^-[/math]
In order to cancel out the electrons, multiply the second by 5 and add into the first:
[math]5Na +MnO4^- + 8H^+ ightarrow 5Na^+ + Mn^{2+} + 4H_2O[/math]
You might want to add back the potassium ion on both sides.
This is pretty much the answer…
More
VOTE